Fifty thousand years of Arctic vegetation and megafaunal diet
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Davison, John
Moora, Mari
Zobel, Martin
Coissac, Eric
Edwards, Mary E.
Lorenzen, Eline D.
Vestergard, Mette
Gussarova, Galina L.
Haile, James
Craine, Joseph
Gielly, Ludovic
Boessenkool, Sanne
Epp, Laura S.
Pearman, Peter B.
Cheddadi, Rachid
Murray, David
Brathen, Kari Anne
Yoccoz, Nigel
Binney, Heather
Cruaud, Corinne
Wincker, Patrick
Goslar, Tomasz
Alsos, Inger Greve
Bellemain, Eva
Brysting, Anne Krag
Elven, Reidar
Sonstebo, Jorn Henrick
Murton, Julian
et al.
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Abstract
Although it is generally agreed that the Arctic flora is among the youngest and least diverse on Earth, the processes that shaped it are poorly understood. Here we present 50 thousand years (kyr) of Arctic vegetation history, derived from the first large-scale ancient DNA metabarcoding study of circumpolar plant diversity. For this interval we also explore nematode diversity as a proxy for modelling vegetation cover and soil quality, and diets of herbivorous megafaunal mammals, many of which became extinct around 10 kyr bp (before present). For much of the period investigated, Arctic vegetation consisted of dry steppe-tundra dominated by forbs (non-graminoid herbaceous vascular plants). During the Last Glacial Maximum (25–15 kyr bp), diversity declined markedly, although forbs remained dominant. Much changed after 10 kyr bp, with the appearance of moist tundra dominated by woody plants and graminoids. Our analyses indicate that both graminoids and forbs would have featured in megafaunal diets. As such, our findings question the predominance of a Late Quaternary graminoid-dominated Arctic mammoth steppe.
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Nature
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506
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7486
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Population, Ecological and Evolutionary Genetics